3600/a+3600/b=7504800/a+2400/b=700

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3600/a+3600/b=7504800/a+2400/b=7003600/a+3600/b=7504800/a+2400/b=7003600/a+3600/b=7504800/a+2400/b=7

3600/a+3600/b=7504800/a+2400/b=700
3600/a+3600/b=750
4800/a+2400/b=700

3600/a+3600/b=7504800/a+2400/b=700
3600/a+3600/b=750.1)
4800/a+2400/b=700 .2)
2)*3-1)*2得:7200/a=600,a=12
1)*4-2)*3得:7200/b=900,b=8
所以
a=12,b=8

a=12
b=8

设1/a=X, 1/b=Y,
则原方程化为:3600X+3600Y=750,4800X+2400Y=700,
化简得:72X+72Y=15,48X+24Y=7
解得:X=1/12,Y=1/8
所以:a=12, b=8